Statistics – Computation
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..184w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Nov. 1, 1991, p. 184-192. Research supported by Ro
Statistics
Computation
20
Accretion Disks, Active Galactic Nuclei, Mass To Light Ratios, X Ray Binaries, Acoustic Instability, Black Holes (Astronomy), Computational Astrophysics, Seyfert Galaxies, Variability, Viscosity
Scientific paper
The influence of the central mass and two viscosity parameters on the slim disk stability is studied. It is suggested that various types of observed quasi-periodic behavior may be connected with slim disk instability. If this turns out to be correct, the so-called normal and horizontal branch oscillations could be due to unstable thermal and acoustic modes, respectively. It is shown that some of the observed short-term (quasi-periodic) variability in AGN may also originate from short-wavelength acoustic modes in the innermost region of the disk. Consequently, observationl characteristics, in connection with stability theory, may yield estimates of basic accretion parameters. In the case of the Seyfer galaxy NGC 6814, this process seems to favor (alpha, mu, m, m-dot) approximately equal to (0.5, 0, 10 exp 6, 0.01).
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